Grain-polishing apparatus



Ff. H. SCHULE. GRAIN PoLIsHING APPARATUS.

(No Model.)

Patented June 21, 189,8.'

@Miren 'STATES PATENT I trice@ FRIEDRICH HERMANN SCHULE,` OE HAMBURG, GERMANY, `ASSIGN OR TO PEMBROKE JONES, OENEW HANOVER COUNTY, NORTH CAROLINA.

GRAIN-POLISHING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 605,922, dated June 21, 1898.

Application ned-April 17,1897.'

T0 all 11171/0777/ t may concern:

Be it known that I, FRIEDRICH HERMANN SCHULE, a subject of the German Emperor, and a resident of Hamburg, in the German Empire, have invented certain new and useful Improvements in Grain-Polishing Apparatus, of which the following is a specification.

My invention relates to improvements in polishing apparatus of the kind used for polishing grains coming from grinding-mills'and like apparatus.

The object of the improvements is to provide means for facilitating the renewal and adjustment of the polishing-surface.

With this end in view my invention consists of certain novel features of construction and combinations of parts, as will be hereinafter fully described with reference to the accompanying drawings, in which- Figure lis a sectional side elevation of my improved grain-polishin g apparatus; and Fi g. 2, a horizontal transverse section of the same on the line l 2, Fig. l.

Similar letters refer to similar parts throughout the figures.

In a suitable casing a, closed at the top and bottom by suitable covers a' and a2, respectively, and carried by supports or brackets a3, is mounted an annular sieve b, of a preferably conical form, as shown in Fig. l. Vithin this conical sieve 1),-made of wire-gauze or perforated sheet metal, there is arranged a conical revolving drum D, fixed upon a vertical driving-shaft c, journaled in suitable bearings d and e of the top and bottom cover a and d2, respectively. The conical drumlis composed of a series of sector-shaped staves or bars f, held together, like the staves of a bucket or cask, by means of a top plate g, a bottom plate g/,and detachable hooks h an d L'.'

Between the bars or staves f are clamped strips or iiaps z', of a flexible material-c. g., moleskin-adapted for polishing purposes. The said strips t' are of such a breadth that when placed in proper position will radiate from the conical drum, as shown in Fig. 2, their outer edges collectively forming a circular yielding polishing-surface designed for polishing the grains passing down the annular space between the sieve b and the revolving drum D, while the'inner edges project bese'riai No. 632,625. N0 model.)

yond the opposite faces of the drum into the interior thereof and are designed to be pushed forward to the outer periphery to take up the wear. The neatly-polished grains leave the polishing apparatus through an outlet k, to which they are conveyed bysuitable sweepers I, attached to the bottom plate g of the drum D. The waste, dust, and the like will pass 'through the sieve b into the casing a, whence they fall through openings a4 of the-bottom plate a2 into a suitable chute m, each half of the casing a. being provided with such a chute m. The feeding of the grains to be polished may be effected through a suitable inlet-hole a5 of the top cover a'.

The spacing distance between the drum D and the sieve-cone b may be changed, according to the size of the grains to be polished, by raising or lowering the conical drum D in the cone b. This raising or lowering of the drum D may be effected by means of the movable bearing e of the driving-shaft c, which bearing e may be adjusted in height by means of a hand-wheel n, as will be clearly understood from Fig. l.

lVhen the polishing-strips t are worn off, the drum D is taken out of the polishing apparatus and the rm joining or connection of the staves f is ceased by loosening the hoops 7L h', so that the strips f may somewhat be drawn out and adjusted in such a position that the polishing edges of the said strips project again ythe proper distance beyond the circumference of the drum, whereupon the hoops 7i 7L' are securely fastened.

It is obvious that by the above-described means for adjusting the polishing-strips a considerable amount. of time, labor, and polishing material is saved which otherwise would be wasted, as is the case in such machines where the polishing material is attached to the outer surface of a solid drum and where it must be renewed wholly when it is but partly'worn away.

Having fully described my invention, what Idesire to claim and secure by Letters Patent 1sl. In a grain-polishing machine, a polishing-drum composed of two heads, the 'upper head provided Von its under face with acircular groovey the inner wall-of whichis'higher polishing- IOO than the outer wall and forms a bearing, the lower head provided with a stepped peripheral seat and with a downwardly-projeeting peripheral flange, staves stepped in said seat and having bearing on the inner flange of the peripheral groove in the upper head', a polishing fabric clamped between said staves,

'and clamping hoops or bands detachably secured to the outer peripheral flanges of the heads, for the purpose set forth.

2. In a grain-polishing machine a polish* ing-drum composed of two heads, staves having bearing on said heads, andv clamping de- Vices for clamping the staves removably to the heads; in combination with a flexible strip of polishing material between each two staves of such a Width relatively to the thickness of said staves as to project from opposite faces thereof, whereby saidstrips can be drawn out from between the staves, for the purpose set forth.

In testimony that l claim the foregoing as my invention l have sign ed my naine, in presence of two witnesses7 this 30th day of Jannary, 1897.

FRIEDRICH HERMANN SCHULE.

itnessesz MAX LEMCKE, MAX K AEMPFF. 

